Mailchimp charges for unsubscribed contacts and stranded list owners need automated billing-contact hygiene

Mailchimp bills for ALL contacts including unsubscribed, cleaned, and archived ones. Free plan was cut from 2,000 contacts (2022) to 250 (2026). Legacy plans hit 11-13% increases April 2026. Average list has 13-14% non-sendable contacts by end of year (weekly sender baseline), inflating bills 20-40%. Users report paying $45/mo for 1,000 contacts they can barely send to. No dedicated tool continuously monitors and purges non-sendable contact accumulation before each billing cycle across ESPs. Existing email validation tools check deliverability only; they do not manage billing-tier contact counts or automate archiving on a schedule keyed to billing dates.